/* ============================================================
   nav-sidebar.css — Shared Navigation Sidebar
   ============================================================
   Persistent left sidebar on dashboard/settings pages.
   Hamburger-toggled overlay on focus pages (transactions,
   investments).
   ============================================================ */

/* ── Sidebar Container ─────────────────────────────────────── */
.nav-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 220px;
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease;
}

/* ── App Brand ─────────────────────────────────────────────── */
.nav-sidebar-brand {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-sidebar-brand img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav-sidebar-brand span {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-heading);
  white-space: nowrap;
}

/* ── Navigation Links ──────────────────────────────────────── */
.nav-sidebar-links {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  list-style: none;
}

.nav-sidebar-links li {
  list-style: none;
}

.nav-sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  cursor: pointer;
}

.nav-sidebar-link:hover {
  background: var(--bg-hover);
  color: var(--text-bright);
}

.nav-sidebar-link.active {
  background: var(--bg-surface-elevated);
  color: var(--accent-link);
  border-left-color: var(--accent-primary);
  font-weight: 600;
}

.nav-sidebar-link .nav-icon {
  font-size: 16px;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

/* ── Sub-Navigation (expandable children) ──────────────────── */
.nav-sidebar-subnav {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.nav-sidebar-subnav.expanded {
  max-height: 300px;
}

.nav-sidebar-subnav .nav-sidebar-link {
  padding: 9px 18px 9px 50px;
  font-size: 13px;
  font-weight: 400;
  border-left: none;
}

.nav-sidebar-subnav .nav-sidebar-link.active {
  color: var(--accent-link);
  background: var(--bg-selected);
  font-weight: 600;
  border-left: none;
}

.nav-sidebar-subnav .nav-sidebar-link:hover {
  background: var(--bg-hover);
}

/* Chevron indicator on parent items with sub-nav */
.nav-sidebar-link .nav-chevron {
  margin-left: auto;
  font-size: 10px;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.nav-sidebar-link.expanded .nav-chevron {
  transform: rotate(90deg);
}

/* ── Footer (bottom-pinned items: Settings, Logout) ────────── */
.nav-sidebar-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 8px 0;
  flex-shrink: 0;
  list-style: none;
}

.nav-sidebar-footer li {
  list-style: none;
}

/* ── Persistent mode: sidebar always visible, content shifted ─ */
body[data-nav-mode="persistent"] {
  padding-left: 220px;
}

body[data-nav-mode="persistent"] .nav-sidebar {
  transform: translateX(0);
}

/* ── Collapsed mode: sidebar hidden off-screen by default ──── */
body[data-nav-mode="collapsed"] .nav-sidebar {
  transform: translateX(-100%);
}

body[data-nav-mode="collapsed"] .nav-sidebar.open {
  transform: translateX(0);
}

/* Overlay backdrop when sidebar is open in collapsed mode */
.nav-sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-overlay);
  z-index: 999;
}

body[data-nav-mode="collapsed"] .nav-sidebar-overlay.visible {
  display: block;
}

/* ── Hamburger Button (collapsed mode only) ────────────────── */
.nav-hamburger {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 998;
  width: 38px;
  height: 38px;
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: 6px;
  cursor: pointer;
  display: none;                 /* hidden by default */
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s;
}

.nav-hamburger:hover {
  background: var(--bg-hover);
}

/* Three-dash icon via pseudo-elements */
.nav-hamburger-icon,
.nav-hamburger-icon::before,
.nav-hamburger-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.2s ease;
}

.nav-hamburger-icon {
  position: relative;
}

.nav-hamburger-icon::before,
.nav-hamburger-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.nav-hamburger-icon::before {
  top: -6px;
}

.nav-hamburger-icon::after {
  top: 6px;
}

/* Show hamburger only in collapsed mode */
body[data-nav-mode="collapsed"] .nav-hamburger {
  display: flex;
}

/* Why: ensure page content doesn't hide behind the fixed hamburger */
body[data-nav-mode="collapsed"] .page-header {
  padding-left: 56px;
}

/* ── Responsive: collapse persistent sidebar on small screens ─ */
@media (max-width: 900px) {
  body[data-nav-mode="persistent"] {
    padding-left: 0;
  }

  body[data-nav-mode="persistent"] .nav-sidebar {
    transform: translateX(-100%);
  }

  body[data-nav-mode="persistent"] .nav-sidebar.open {
    transform: translateX(0);
  }

  body[data-nav-mode="persistent"] .nav-hamburger {
    display: flex;
  }

  body[data-nav-mode="persistent"] .nav-sidebar-overlay.visible {
    display: block;
  }
}